Ext.util.base64 = {

	base64s : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",

	encode: function(decStr){
		if (typeof btoa === 'function') {
			return btoa(decStr);
		}
		var base64s = this.base64s;
		var bits;
		var dual;
		var i = 0;
		var encOut = "";
		while(decStr.length >= i + 3){
			bits = (decStr.charCodeAt(i++) & 0xff) <<16 | (decStr.charCodeAt(i++) & 0xff) <<8 | decStr.charCodeAt(i++) & 0xff;
			encOut += base64s.charAt((bits & 0x00fc0000) >>18) + base64s.charAt((bits & 0x0003f000) >>12) + base64s.charAt((bits & 0x00000fc0) >> 6) + base64s.charAt((bits & 0x0000003f));
		}
		if(decStr.length -i > 0 && decStr.length -i < 3){
			dual = Boolean(decStr.length -i -1);
			bits = ((decStr.charCodeAt(i++) & 0xff) <<16) |    (dual ? (decStr.charCodeAt(i) & 0xff) <<8 : 0);
			encOut += base64s.charAt((bits & 0x00fc0000) >>18) + base64s.charAt((bits & 0x0003f000) >>12) + (dual ? base64s.charAt((bits & 0x00000fc0) >>6) : '=') + '=';
		}
		return(encOut);
	},

	decode: function(encStr){
		if (typeof atob === 'function') {
			return atob(encStr);
		}
		var base64s = this.base64s;
		var bits;
		var decOut = "";
		var i = 0;
		for(; i<encStr.length; i += 4){
			bits = (base64s.indexOf(encStr.charAt(i)) & 0xff) <<18 | (base64s.indexOf(encStr.charAt(i +1)) & 0xff) <<12 | (base64s.indexOf(encStr.charAt(i +2)) & 0xff) << 6 | base64s.indexOf(encStr.charAt(i +3)) & 0xff;
			decOut += String.fromCharCode((bits & 0xff0000) >>16, (bits & 0xff00) >>8, bits & 0xff);
		}
		if(encStr.charCodeAt(i -2) == 61){
			return(decOut.substring(0, decOut.length -2));
		}
		else if(encStr.charCodeAt(i -1) == 61){
			return(decOut.substring(0, decOut.length -1));
		}
		else {
			return(decOut);
		}
	}
};